How do find Max RAM speeds on core 2 duo?

[keldegar]

I have a P5B-E and my max vdimm is 2.1v

How can I find my max RAM speeds safely? My memory is corsair xms2 ddr2-675 5400C4PT. Redbeard says it is some kind of Micron IC, but not the same one in the 8500C4 dominators.

My computer is rock solid stable @ 3.2ghz, and DDR2-800, 4-4-4-12

I just recently tried 3.4ghz, DDR2-850, 4-4-4-12 and it fails orthos blend very quickly (but doesn't crash or anything). it also fails with 5-5-5-15 timings. It also passes small FFTs for about 15min (i stopped it since It wasnt stable on blend anyway).

I am now trying 3.3ghz, DDR2-826, 4-4-4-12, and I am passing orthos blend 1hr+ so far..

does this seem like I have hit a memory speed wall? my mobo can't put anymore volts into vdimm. or could it possibly be something else?

 

[thrawn86]

pretty basic OC stuff, keep cranking that fsb and lowering your cpu multiplier (to make sure its not your cpu thats maxxing). If it fails blend test, then you've hit a wall

 

[keldegar]

ah ok lemme try dropping my cpu multi to 6.

one question, aside from vdimm what can I try to get my RAM to run at higher speeds?

so far it passed running at DDR2-826mhz @ 4-4-4-12 for 5 hours orthos blend.

 

[thrawn86]

you're running your ram over spec and with max voltage at loose timings (you could try 5-5-5 though), there's not much else you can do. perhaps one of those DDR boosters will help, but I don't have any experience with those.

 

[keldegar]

Thanks for your advice. I guess I should be happy to get my RAM running that high. I still feel like this RAM and CPU have more in it, I shoulda got the p5b deluxe. I think 2.2v vdimm and my ram could hit 900mhz, seeing as its doing 826mhz at 4-4-4 with only 2.1v. Maybe when the cheaper quads come out ill get a new mobo. Thanks!